This recipe is pretty simple and easy to make. Take Concorde grapes, wash under running water and stem. Place grapes in a large pot over low heat with 1/2 cup water and 1/2 cup sugar, let grapes heat until the fruit is softened - about 30 mins. Turn off stove and let sit to cool a bit - then smoosh grapes thru a fine sieve by hand with potato masher. Take the juice below sieve and measure it - I had 6 cups juice and I add water as a 1:1 ratio (Adding 6 cups water) and taste to see if any more sugar is needed - usually not but, a 1/2 sugar more is sometimes preferred... Bring juice to a quick boil and jars to 1/4" headspace & process in waterbath or steam canner for 10 minutes pints and quarts *adjusting for your altitude.